Struct datafusion::optimizer::eliminate_one_union::EliminateOneUnion

pub struct EliminateOneUnion;

An optimization rule that eliminates union with one element.

Implementations

impl EliminateOneUnion

pub fn new() -> EliminateOneUnion

Trait Implementations

impl Default for EliminateOneUnion

fn default() -> EliminateOneUnion

Returns the “default value” for a type.

impl OptimizerRule for EliminateOneUnion

fn name(&self) -> &str

A human readable name for this optimizer rule

fn supports_rewrite(&self) -> bool

Does this rule support rewriting owned plans (rather than by reference)?

fn rewrite( &self, plan: LogicalPlan, _config: &dyn OptimizerConfig, ) -> Result<Transformed<LogicalPlan>, DataFusionError>

Try to rewrite plan to an optimized form, returning Transformed::yes if the plan was rewritten and Transformed::no if it was not.

fn apply_order(&self) -> Option<ApplyOrder>

How should the rule be applied by the optimizer? See comments on ApplyOrder for details.

fn try_optimize( &self, _plan: &LogicalPlan, _config: &dyn OptimizerConfig, ) -> Result<Option<LogicalPlan>, DataFusionError>

👎Deprecated since 40.0.0: please implement supports_rewrite and rewrite instead

Try and rewrite plan to an optimized form, returning None if the plan cannot be optimized by this rule.